<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!--卡片视图区域-->
    <el-card>
      <!--提示区域-->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"/>
      <!--步骤条区域-->
      <el-steps :space="200" :active="activeIndex - 0"
                finish-status="success"
                align-center>
        <el-step title="基本信息"/>
        <el-step title="商品参数"/>
        <el-step title="商品属性"/>
        <el-step title="商品图片"/>
        <el-step title="商品内容"/>
        <el-step title="完成"/>
      </el-steps>

      <!--tab栏区域-->
      <el-form
          :model="addForm"
          :rules="addFormRules"
          ref="addFormRef"
          label-width="100px"
          label-position="top">
        <el-tabs :tab-position="tabPosition"
                 v-model="activeIndex"
                 :before-leave="beforeTabLeave"
                 @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"/>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"/>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"/>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number"/>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader expand-trigger="hover"
                           :options="cateList"
                           :props="cateProps"
                           v-model="addForm.goods_cat"
                           @change="handleChange"
                           ref="cascaderHandle">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!--渲染表单的item项-->
            <el-form-item :label="item.attr_name"
                    v-for="item in manyTableData"
                    :key="item.attr_id">
              <!--复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox border :label="cb"
                             v-for="(cb, index) in item.attr_vals"
                             :key="index"/>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name"
                          v-for="item in onlyTableData"
                          :key="item.attr_id">
              <el-input v-model="item.attr_vals"/>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--
              action: 表示图片要上传的后台API地址
              on-preview: 预览图片
              on-remove: 移除图片
              file-list: 文件列表
              list-type: 指定upload组件渲染效果
              headers: 图片上传组件的headers请求头对象
              on-success: 监听图片上传成功事件
            -->
            <el-upload :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers="headerObj"
                :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!--富文本编辑器组件-->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!--添加商品按钮-->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>


    <!--图片预览-->
    <el-dialog title="图片预览"
               :visible.sync="previewVisible"
               width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  name: "Add",
  data () {
    return{
      activeIndex: '0',
      tabPosition: 'left',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        pics: [],
        goods_introduce: '',
        attrs: []
      },
      addFormRules: {
        goods_name: [
          {required: true, message: '请输入商品名称', trigger: 'blur'}
        ],
        goods_price: [
          {required: true, message: '请输入商品价格', trigger: 'blur'}
        ],
        goods_weight: [
          {required: true, message: '请输入商品重量', trigger: 'blur'}
        ],
        goods_number: [
          {required: true, message: '请输入商品数量', trigger: 'blur'}
        ],
        goods_cat: [
          {required: true, message: '请选择商品分类', trigger: 'blur'}
        ]
      },
      // 商品分类列表
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数数据
      manyTableData: [],
      onlyTableData: [],
      // 上传图片的URL地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      previewPath: '',
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const {data: res} = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败! ')
      }

      this.cateList = res.data
    },// 级联选择器选中项变化触发
    handleChange() {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
        this.$refs.cascaderHandle.dropDownVisible=false
      }
    },
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类! ')
        return false
      }
    },
    async tabClicked() {
      if (this.activeIndex === '1') {
       const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
           {
             params: {sel: 'many'}
           })

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败! ')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }else if (this.activeIndex === '2') {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
        {
          params: {sel: 'only'}
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性列表失败! ')
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览事件
    handlePreview(file) {
      this.previewPath = file.response.data.url

      this.previewVisible = true
    },
    // 删除图片
    handleRemove(file) {
      // 1.获取将要删除图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中, 找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x =>
      x.pic === filePath)
      // 3.调用数组的 splice 方法, 把图片信息对象, 从pics数组中移除
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功事件
    handleSuccess(response) {
      // 1. 拼接得到图片信息对象
      const picInfo = { pic: response.data.tmp_path}
      // 2. 将图片信息, push到pics数组中
      this.addForm.pics.push(picInfo)

    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项! ')
        }

        // 单行添加的业务逻辑
        // _.cloneDeep深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_val
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        console.log(form)

        const {data: res} = await this.$http.post('goods', form)

        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败! ')
        }

        this.$message.success('添加商品成功! ')
        this.$router.push('/goods')
      })
    }

  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style scoped lang="less">
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg{
  width: 100%;
}

.btnAdd{
  margin-top: 15px;
}
</style>